4 Family members killed in Iowa house fire on Christmas morning

BLUE GRASS, Iowa — Police say all four people killed by an early Christmas morning house fire in eastern Iowa belonged to one family.

The blaze erupted a little after 12:30 a.m. Monday in Blue Grass. Police say one of the four people inside the home managed to escape but died later at a hospital. The three others perished inside the ranch-style house.

READ MORE: Single mom and three kids lose Alberta home to fire, days before Christmas

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Blue Grass police Sgt. Garrett Jahns said Tuesday that he couldn’t release any of the victims’ names or ages yet but that the four were related.

WATCH: Kitsilano home is gutted in early morning fire

2:42 Kitsilano home is gutted in early morning fire

State Fire Marshal Division spokesman Ron Humphrey says the cause of the fire remains under investigation.

Blue Grass is a community of about 1,500 residents 150 miles (240 kilometers) east of Des Moines.